diff options
| author | Peter Hurley <peter@hurleysoftware.com> | 2014-09-10 14:31:39 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-12-30 02:26:00 +0000 |
| commit | 377ace8bdcb36a3961b894f20090d8fae1197872 (patch) | |
| tree | 28e98a19c9b24dc85a8deafd97d0e7062e8954b5 /include | |
| parent | b1fa852672fb1ea4b0e34bfa1136bb65dba66151 (diff) | |
| download | lwn-377ace8bdcb36a3961b894f20090d8fae1197872.tar.gz lwn-377ace8bdcb36a3961b894f20090d8fae1197872.zip | |
locking: Add WARN_ON_ONCE lock assertion
commit 9a37110d20c95d1ebf6c04881177fe8f62831db2 upstream.
An interface may need to assert a lock invariant and not flood the
system logs; add a lockdep helper macro equivalent to
lockdep_assert_held() which only WARNs once.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/lockdep.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index b6a56e37284c..8b9bbf1d5b6e 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -342,6 +342,9 @@ extern void lockdep_trace_alloc(gfp_t mask); #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) #define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l)) +#define lockdep_assert_held_once(l) do { \ + WARN_ON_ONCE(debug_locks && !lockdep_is_held(l)); \ + } while (0) #else /* !LOCKDEP */ @@ -362,6 +365,7 @@ static inline void lockdep_on(void) # define lockdep_trace_alloc(g) do { } while (0) # define lockdep_init() do { } while (0) # define lockdep_info() do { } while (0) + # define lockdep_init_map(lock, name, key, sub) \ do { (void)(name); (void)(key); } while (0) # define lockdep_set_class(lock, key) do { (void)(key); } while (0) @@ -391,6 +395,7 @@ struct lock_class_key { }; #define lockdep_depth(tsk) (0) #define lockdep_assert_held(l) do { } while (0) +#define lockdep_assert_held_once(l) do { (void)(l); } while (0) #endif /* !LOCKDEP */ |